Abstract
Oogenesis in Anisocampium sheareri was studied using ultrastructural methods to examine the egg structure influencing fertilization in the core leptosporangiate ferns,which is less studied.Ultrastructural observations indicated that the young egg and the canal cells are closely connected with each other in the cavity of the archegonium.Then,a separation cavity and a temporary wall are first formed above the egg during oogenesis with a pore region persistently connecting the egg and the ventral canal cell.The egg envelope is formed by deposition of amorphous materials in the separation cavity on the outer surface of plasmalemma.The egg envelope is not formed across the pore region;instead,a fertilization pore is formed.In the later stage of oogenesis,the egg nucleus becomes highly irregular and produces extensive evaginations and nuclear holds.The present investigation provided new data on oogenesis of the ferns,which contributes to understanding the cytological mechanism of the sexual reproduction of ferns and their evolution.
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Claims 5
Claim · model-written summary
The young egg and canal cells were closely connected in the archegonium.
- Taxon
- Anisocampium sheareriAthyrium shearerit0
- Organ / stage
- young egg and the canal cellse0
- Outcome
- closely connected with each other in the cavity of the archegoniume0
Verbatim
e0“the young egg and the canal cells are closely connected with each other in the cavity of the archegonium”
t0“Anisocampium sheareri”
Claim · model-written summary
A separation cavity and temporary wall formed above the egg while a pore region persisted.
- Taxon
- Anisocampium sheareriAthyrium shearerit0
- Organ / stage
- egge0
- Outcome
- separation cavity and a temporary wall are first formed above the egg during oogenesis with a pore region persistently connecting the egg and the ventral canal celle0
Verbatim
e0“a separation cavity and a temporary wall are first formed above the egg during oogenesis with a pore region persistently connecting the egg and the ventral canal cell”
t0“Anisocampium sheareri”
Claim · model-written summary
The egg envelope formed by deposition of amorphous material in the separation cavity.
- Taxon
- Anisocampium sheareriAthyrium shearerit0
- Organ / stage
- egg envelopee0
- Outcome
- formed by deposition of amorphous materials in the separation cavity on the outer surface of plasmalemmae0
Verbatim
e0“The egg envelope is formed by deposition of amorphous materials in the separation cavity on the outer surface of plasmalemma”
t0“Anisocampium sheareri”
Claim · model-written summary
The egg envelope did not form across the pore region, yielding a fertilization pore.
- Taxon
- Anisocampium sheareriAthyrium shearerit0
- Organ / stage
- egg envelopee0
- Outcome
- fertilization pore is formede0
Verbatim
e0“The egg envelope is not formed across the pore region;instead,a fertilization pore is formed”
t0“Anisocampium sheareri”
Claim · model-written summary
Late in oogenesis, the egg nucleus became irregular and produced extensive evaginations and nuclear holds.
- Taxon
- Anisocampium sheareriAthyrium shearerit0
- Organ / stage
- egg nucleuse0
- Outcome
- highly irregular and produces extensive evaginations and nuclear holdse0
Verbatim
e0“the egg nucleus becomes highly irregular and produces extensive evaginations and nuclear holds”
t0“Anisocampium sheareri”